Every io.lotus.call_state push allocated a new Set, re-rendering the
app-wide call bar for the whole call. nextSpeakerSet() returns the
previous reference when membership is unchanged (pure helpers in
utils/speakerSet.ts, unit-tested), and the DOM MutationObserver fallback
in useCallSpeakers/useRemoteAllMuted is attached only while the fork's
participant list is unavailable.
Fixes#32
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA
